Semi-automatic DIY Spot Welder 2,6V 1kA

4093 NAND gate two-step timer Adjustable welding time from 0 to 4 seconds MOC3041 zero-crossing detection BT138 - 12A triac Almost 2 meters of 35mm² LGY copper cable 4 secondary windings = 2,6V 950A - 1000A of short circuit current Arms working lenght 24cm